从java应用程序到applet？

Question

I never worked with applets and have the following questions:

• can an existing Java Desktop App be ported to an Applet by just providing a different interface? Can I reuse everything that's behind the GUI (services, injections, databases)?

• is the same possible for Java EE applications? Just provide a different UI and reuse the rest of the code?

Answer 1

Basicly you just have to embed the JFrame, or whatever you used before, in an Class,which is extending an Applet. No you can´t use everything, there are some security restrictions for Applets(acces to the filesystem for example) until they are getting signed.

Answer 2

The UI, etc. for the most part is 'reusable', but the applet is also subject to stricter Sandboxing; the applet is limited to only the permissions that the user allows and/or additions to the JVM settings on the user machine. (There are also restrictions on port access for applets for things like database connections - and possible firewall considerations.

So, the answer is a "yes, but there is still a lot of work. Get to know what kind of work that would be based on your user base.

Answer 3

Basically when you are making applets you can't use frames or a menu. You should use panels and work on them. Most of things after that are simple and same.